Corrosion mechanism of cement-bonded Al2O3-MgAl2O4 pre-cast castables in contact with molten steel and slag

作者：Xiao, Junli; Chen, Junfeng^*; Li, Yuanyuan; Cheng, Yaping; Nath, Mithun; Zhang, Yu^*; Zheng, Lijun; Wei, Yaowu; Zhang, Shaowei; Li, Nan

来源：Ceramics International, 2022, 48(4): 5168-5173.

DOI：10.1016/j.ceramint.2021.11.056

• Spinel-containing refractories
• Corroded microstructure
• Corrosion mechanism
• Molten steel

In this work, a cement-bonded corundum-spinel (Al2O3-MgAl2O4) pre-cast refractory brick with two typical Al2O3 aggregates was designed as the refractory lining. Corroded microstructure of the used corundum-spinel bricks after industrial trials in a commercial RH refining ladle was analyzed. Degradation processes of two types of alumina aggregates in the same corroded interface also were discussed. Typical corroded microstructure revealed that needle-like calcium hexaaluminate (CA6) was observed in the matrix of the original layer. The formation of CA6 was attributed to the reactions with pure calcium aluminate cement and matrix components under a high-temperature gradient during refining. Furthermore, the corrosion process of the used Al2O3-MgAl2O4 bricks would be discussed based on a post-mortem microstructural characterization, and the corrosion mechanism of the two types of aggregates was also elucidated.

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